PNNL

Abstract

We report a new sensitive search for CPT violation, which includes improved measurements of the CPT-violating parameter z and the total decay-width difference normalized to the averaged width ?Gd/Gd of the two Bd mass eigenstates. The results are based on a data sample of 535×106 BB¯ pairs collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain Re(z)=[+1.9±3.7(stat)±3.3(syst)]×10-2, Im(z)=[-5.7±3.3(stat)±3.3(syst)]×10-3, and ?Gd/Gd=[-1.7±1.8(stat)±1.1(syst)]×10-2, all of which are consistent with zero. This is the most precise single measurement of these parameters in the neutral B-meson system to date.